Question about 1998 Nissan Altima

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A/c not working, fans come on but not a/c. when i

A/c not working, fans come on but not a/c. when i jump the a/c relay with paper clip, compressor comes on, blowing cold air, but fans not working, so pressure builds up on the high side

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The fans don't come on when you jump the a/c clutch relay because the fans are controlled by a different relay. Have you put gauges on the a/c system? If the system pressure is too low or too high the compressor won't come on.

Posted on Jul 07, 2010

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You need a wiring diagram for that answer

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Jumping the power contacts of a relay to get the compressor
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Normal pressure with the engine-compressor off is outside air temp. So both gauges would read 70 or 80 or whatever.
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